JPH0147105B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a frame body formed of a molding material such as resin, which is used as a drive source for, for example, a canned type electric circulation pump device, and which molds a stator. The present invention relates to improvements to the cand motor equipped with the present invention.

[Prior art] As a conventional motor of this type, the
As disclosed in Japanese Patent No. 115688, there is a device in which a stator is provided with a frame made of a molded material.
By the way, when a motor having such a configuration is constructed as a liquid-sealed motor, it is also conceivable to arrange a well-known can inside the frame. That is, a liquid-sealed can motor is considered, in which a can is arranged on the inner periphery of a frame made of a molded material.
FIG. 2 shows a conventional example having such a configuration. In the figure, reference numeral 1 denotes a stator, and the stator 1 is composed of a stator core 2 and a stator winding 3 wound around the stator core 2. 4
20 is a thin cylindrical can attached to the inner circumferential surface of the stator core 2; 20 is a hollow frame made of a molding material such as resin for molding the stator 1;
A first circumferential groove 20b is formed at a predetermined depth in the axial direction on the inside of the one end portion 20a, and a circumferential groove 20b is formed at a predetermined depth in the radial direction continuously from the inner circumference of the first circumferential groove 20b. A second circumferential groove 20c is formed around the circumference. 21 is a water sealing member such as an O-ring installed in the second circumferential groove 20c in the first circumferential groove 20b, and is used to seal between the inner circumference of the can 4 and the second circumferential groove 20c. Securely sealed.
Note that the inner end side of the can 4 is connected to the first circumferential groove 20b.
It has been inserted deep inside.

[Problems to be Solved by the Invention] However, in such a conventional liquid-sealed can motor, when sealing the inner end side of the can 4, a first annular groove formed in the deep part of the frame body 20, Second
It is necessary to provide circumferential grooves 20b and 20c and attach a water sealing member 21 such as an O-ring, which not only makes it difficult to form the circumferential groove itself, but also requires troublesome work to attach the water sealing member 21 to the circumferential groove. There was a problem with becoming.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a liquid sealing member that can be easily attached to a frame for sealing a can. The goal is to obtain a canned motor.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a stator, a cylindrical frame body in which the stator is molded,
An anti-load side bracket and a load side bracket disposed at openings at both ends of the frame, a rotor shaft rotatably supported by both brackets via bearings, and an inner circumferential surface of the frame. and a liquid sealed in the frame, and an inward shoulder extending radially inward from the inner periphery of the frame is formed at one end opening of the frame. A through hole is formed in the center of this shoulder in the axial direction of the frame, and the anti-load side bracket has a large diameter portion that fits into the inner periphery of the can, and a large diameter portion that fits into the through hole. It has a small diameter part to be fitted, a threaded part passing through the center of the axis, this threaded part is occluded by an embolus, and the embolus has a male threaded part threaded to the threaded part; a first water seal member is interposed between the inner surface of the flange portion and the outer end surface of the anti-load side bracket, and the large diameter A second water seal member is interposed between the outer periphery of the can and the inner periphery of the can.

[Function] In the present invention, the first water seal member is interposed between the inner surface of the flange portion of the embolus and the outer end surface of the anti-load side bracket, and seals the through hole of the frame. The second water sealing member seals a gap between the outer periphery of the large diameter portion of the anti-load side bracket and the inner periphery of the can.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a canned motor according to the present invention. A stator 1 includes a stator core 2 and a stator winding 3 wound around the stator core 2. 4 is a thin cylindrical can attached to the inner circumferential surface of the stator core 2; 5 is a hollow frame with both ends open made of a molding material such as resin; and 5 is a frame body in which the stator 1 is molded. , the can 4 is joined to its inner peripheral surface.

One end opening (opposite load side opening) of the frame 5 has
An inward shoulder 5d is formed that extends radially inward from the inner periphery of the frame 5, and this shoulder 5d
A through hole 5e is formed in the center of the frame body 5 in the axial direction. The opening at one end of the frame 5 is sealed by an anti-load side bracket 7 and an embolus 10.

The anti-load side bracket 7 includes a stepped through hole 7e penetrating through the center of the axis, a threaded part 7f consisting of a male screw part, and a large diameter part 7h fitted into the inner circumferential surface of the can 4. , has a small diameter portion 7g that is fitted into the through hole 5e of the frame 5. The stepped through hole 7e is formed on the inner surface of the anti-load side bracket 7, and is fitted with an anti-load side cylindrical bearing 9 that pivotally supports the anti-load side end of the rotor shaft 16. The threaded portion 7f
is formed on the outer surface of the anti-load side bracket 7, that is, on the tip end surface of the small diameter portion 7g, and is connected to the stepped through hole 5e.
The embolus 10 is screwed together. Note that 7j is a step end face that is brought into close contact with the inner surface of the shoulder portion 5d.

The embolus 10 has a male screw portion 10a that is screwed into the screw portion 7f of the anti-load side bracket 7, and an outward flange portion 10 that abuts the outer end surface of the shoulder portion 5d.
b, and a first water sealing member 8 made of an O-ring or the like is interposed between the inner surface of the flange portion 10b and the outer end surface of the anti-load side bracket 7, thereby sealing the through hole. 5e is sealed watertight. Further, the large diameter portion 7 of the anti-load side bracket 7
An annular groove 7c is formed on the outer circumferential surface of h, and a second water sealing member 11 made of an O-ring or the like is interposed in this annular groove 7c. The outer periphery of the portion 7h and the can 4
The gap between the inner periphery and the inner periphery is watertightly sealed.

Reference numeral 12 denotes a load-side bracket that seals the other end opening (load-side opening) of the frame body 5, and the load-side bracket 12 is formed in a disc shape and has an inner surface, that is, the opposite-load side bracket. A cylindrical boss portion 12b is integrally protruded from the center of the surface facing 7. A through hole 12d is formed in the center of the boss portion 12b to communicate the inside and outside of the load side bracket 12, and a fitting portion 1 with a larger diameter is formed at the outer peripheral base of the through hole 12d.
2a, and an annular groove 12c is formed on the outer peripheral surface. On the other hand, the load side bracket 1
A fitting portion 12e formed of an annular projection is integrally provided near the outer periphery of the outer surface of 2. The load-side bracket 12 is fitted into a fitting portion 5b formed on the outer periphery of the open end surface on the other end side of the frame 5, so that the boss portion 12b is connected to a third water pipe made of an O-ring or the like. It is fitted into the inner periphery of the can 4 via the sealing member 13, and the fitting portion 12a is fitted into a fitting portion 5c formed at the other end opening of the frame body 5. The third water seal member 13 is connected to the boss portion 12b.
This fits into the annular groove 12c of the can 5, thereby watertightly sealing the gap between the inner periphery of the can 5 and the boss portion 12b, in other words, the opening at the other end of the frame 5. Reference numeral 14 denotes a load-side cylindrical bearing fitted into the through hole 12d of the load-side bracket 12, which pivotally supports the other end of the rotor shaft 16.

A rotor core 15 is paired with the stator core 2, and is fitted and fixed to the rotor shaft 16. Further, a buffer member 17 made of synthetic rubber or the like is fitted to the rotor shaft 16, and the rotor core 15 is fitted with a buffer member 17 made of synthetic rubber or the like.
is in close contact with the surface facing the bearing 14. A thrust bearing 18 is interposed between the buffer member 17 and the bearing 14 and is held by the buffer member 17 .

Next, the operation of the canned motor having such a configuration will be explained.

When the operation switch of the canned motor is turned on, the rotor core 15, rotor shaft 16, buffer member 17, and thrust bearing 18 rotate, and the sealed liquid 19
Stir. The stirred sealed liquid 19 lubricates the pair of cylindrical bearings 9 and 14 and the thrust bearing 18.

By the way, the can 4 itself is joined to the inner periphery of the frame 5, and in this state, the anti-load side bracket 7 is inserted into the inner periphery of the can 4 from the opening on the load side of the frame 5. Annular groove 7c of bracket 7
The inner periphery of the can 4 and the outer periphery of the anti-load side bracket 7 are sealed by the second water seal member 11 inside. On the other hand, since the first water seal member 8 is attached to the outer end side of the small diameter portion 7g of the anti-load side bracket 7 in the through hole 5e of the frame 5, the male threaded portion 1 of the embolus 10
0a to the threaded portion 7f of the anti-load side bracket 7, the first water seal member 8 is compressed between the flange portion 10a of the embolus 10 and the outer end of the small diameter portion 7g, and the through hole 5e is compressed. securely sealed.

The anti-load side bracket 7 is securely fixed to the frame body 5 by screwing the male threaded portion 10a of the embolus 10 into the threaded portion 7f. In this manner, the opening at one end of the frame body 5 is reliably sealed by the screwing operation between the anti-load side bracket 7 and the embolus 10.

[Effects of the Invention] As explained above, the canned motor according to the present invention is provided with a shoulder at the open end on the opposite load side of the frame, and an axial through hole communicating with the center of the shoulder. Inside the frame is a non-load-side bracket, which has a small diameter portion that fits into the hole, a large diameter portion that faces the inner circumferential surface of the can and has one end abutting the shoulder, and a threaded engagement portion that is a screw hole. the embolus is screwed into the threaded portion to support the anti-load side bracket, and a first water sealing member is interposed between the two;
Since the second water seal member is interposed between the can and the large diameter portion, it is very easy to assemble the water seal member for sealing the can, improving assembly workability and reducing manufacturing costs. It is possible to achieve a reduction in

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a canned motor according to the present invention, and FIG. 2 is a cross-sectional view of main parts of a conventional canned motor. DESCRIPTION OF SYMBOLS 1... Stator, 2... Stator core, 3... Stator winding, 4... Can, 5... Frame, 5d... Shoulder, 5e... Through hole, 5f... Screwing part , 7... Anti-load side bracket, 7e... Large diameter part, 7f... Threaded part, 7g... Small diameter part, 8... First water seal member,
9... Bearing, 10... Embolus, 10a... Male screw part, 10b... Flange part, 11... Second water seal member, 12... Load side bracket, 14... Bearing, 15... Rotor core , 16...rotor shaft, 1
9...Enclosed liquid.

Claims (1)

[Claims] 1 A stator 1, a cylindrical frame 5 in which this stator 1 is molded, an anti-load side bracket 7 and a load side bracket 12 disposed at both end openings of this frame 5, and both of these. A rotor shaft 16 rotatably supported by brackets 7 and 12 via bearings 9 and 14, a can 4 joined to the inner peripheral surface of the frame 5, and a can 4 enclosed within the frame 5. and an inward shoulder portion 5d extending radially inward from the inner periphery of the frame body 5 at one end opening of the frame body 5.
A through hole 5e is formed in the center of the shoulder portion 5d in the axial direction of the frame 5, and the anti-load side bracket 7 has a large diameter portion that is fitted into the inner periphery of the can 4. 7h, a small diameter portion 7g fitted into the through hole 5e, and a threaded portion 7f passing through the center of the axis.
This threaded part 7f is closed by an embolus 10, and this embolus 10 has a male threaded part 10a that threads into the threaded part 7f, and an outer threaded part 10a that comes into contact with the outer end surface of the shoulder part 5d. A first water seal member 8 is interposed between the inner surface of the flange portion 10b and the outer end surface of the anti-load side bracket 7, and the outer periphery of the large diameter portion 7h and A can motor characterized in that a second water seal member 11 is interposed between the can 4 and the inner periphery thereof.